The correct option is(A): MgCO3
Thermal stability order
\({K_2CO_3 > Na_3CO_3 > Ca CO_3 >MgCO_3}\)
Therefore \({MgCO_3}\) releases \({CO_2}\) most easily
\({MgCO_3 ->[\Delta] MgO + CO_2}\)
Ion having highest hydration enthalpy among the given alkaline earth metal ions is:
